The component with the lowest price in the OIL PUMP schematic is the Spring.
With three applications this Screw is the most specified part.
Parts such as the Oil Pump: E Ring 6mm, Lock Washer, Gasket(14x19.2x2) (nas), Bolt (6x20) are included in the Sp125 1982 (z) Usa (e03) Oil Pump parts fiche.